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Home >> Nissan-Datsun >> 1990 >> Sentra Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/O Codes >> Poor DRIVEABILITY >> Lack Of Power
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Lack Of Power

  1. Check air filter for restriction.
  2. Ensure ignition timing is within specification.
  3. Inspect throttle body ports and valves for deposits, wear or plugging. Clean or replace as necessary.
  4. Connect inductive timing light to spark plug wire and check for weakness in flash.
  5. Ensure engine has adequate compression.
  6. Ensure spark plug wires are within allowable resistance values.
  7. Check for spark using spark tester.
  8. Remove vacuum hose from fuel pressure regulator and monitor for symptom change.
  9. Ensure fuel pressure is within specification.
  10. For Airflow Meter: Enter self-diagnostic Mode III and retrieve codes. If vehicle will not start, crank engine before entering self-diagnostic Mode III.
  11. For Airflow Meter: Enter self-diagnostic Mode V and monitor real-time diagnostic setting of fault codes. Perform appropriate code chart in TESTS W/CODES article.
  12. Disconnect exhaust gas sensor and monitor change in driveability. If it improves, replace sensor. If not, go to 14.
  13. If Equipped: Perform POWER VALVE or SWIRL CONTROL VALVE diagnostic chart in SYSTEM/COMP TESTS article. Use DIAGNOSTIC CHARTS DIRECTORY table in SYSTEM/COMP TESTS article to locate appropriate chart.
  14. Enter self-diagnostic Mode II and monitor fuel metering system operation.
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